Replace usage of jerryx_print_byte, jerryx_print_string with jerryx_print_buffer.
As we now have JERRY_ZSTR_ARG, so we can take advantage of it
With this, the jerry_port_print_byte port api won't need any more
this reduced the port api surface
JerryScript-DCO-1.0-Signed-off-by: Yonggang Luo [email protected]